html {
  /*rem 相对根元素的font-size, r -> root*/
  /* 16 * 62.5 -> 10px */
  /* font-size: 62.5%; */
}

body {
  margin: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.ml_1 {
  margin-left: 1rem;
}
.ml_2 {
  margin-left: 2rem;
}
.ml_3 {
  margin-left: 3rem;
}
.mr_2 {
  margin-right: 2rem;
}

.mb_1 {
  margin-bottom: 1rem;
}
.mt_1 {
  margin-top: 1rem;
}
.mt_2 {
  margin-top: 2rem;
}
.mt_normal {
  margin-top: 1.5rem;
}


.primary {
  color: #31BCE9;
}
.secondary {
  color: #979797;
}
.secondary2 {
  color: #666666;
}
.orange {
  color: #FF9464;
}


.fs_middle {
  font-size: 2rem;
}
.fs_normal {
  font-size: 1.5rem;
}
.fs_small {
  font-size: 1rem;
}
.fs_small2 {
  font-size: 0.8rem;
}

.active_btn {
  border: 1px solid #FF9464;
  color: #FF9464;
  text-align: center;
  width: 9.4rem;
  height: 1.8rem;
  margin-right: 2rem;
  font-size: 1.4rem;
  line-height: 1.8rem;
  border-radius: 0.9rem;
}
.secondary_btn {
  border: 1px solid #D8D8D8;
  color: #D8D8D8;
  text-align: center;
  width: 9.4rem;
  height: 1.8rem;
  margin-right: 2rem;
  font-size: 1.4rem;
  line-height: 1.8rem;
  border-radius: 0.9rem;
}

.j_sb {
  justify-content: space-between;
}
.j_end {
  justify-content: flex-end;
}
.a_center {
  align-items: center;
}

